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TABLE OF CONTENTS <br /> Page <br /> EXECUTIVE SUMMARY <br /> 1.0 INTRODUCTION 1 <br /> 1 1 Background Information 1 <br /> 12 Regulatory Concerns I <br /> 13 Purpose of the Current Investigation 2 <br /> 14 Specific Objectives 2 <br /> 2.0 PROCEDURES 3 <br /> 2 1 Drilling and Sampling 3 <br /> 2 2 Well Construction and Surveying 3 <br /> 2 3 Groundwater Morutonng 4 <br /> 3.0 RESULTS 4 <br /> 3 1 Subsurface Stratigraphy 4 <br /> 3 1 1 Modesto Formation 4 <br /> 3 12 Riverbank Formation 5 <br /> 3 2 Hydrogeologic Units 5 <br /> 3 3 Field Evidence of Soil Contamination 6 <br /> . 3 4 Laboratory Evidence of Soil Contamination 6 <br /> 3 5 Laboratory Evidence of Groundwater Contamination 7 <br /> 3 6 Groundwater Gradient and Flow Direction 8 <br /> 4.0 NEARBY WELL SURVEY 9 <br /> 5.0 CONCLUSIONS 9 <br /> 6.0 RECOMMENDATIONS 11 <br />